c程序——最简单的计算机

#include <stdio.h>

double calculator(double a, double b, char operation)
{
    if(operation=='+')
    {
        return a+b;
    }
    else if(operation=='-')
    {
        return a-b;
    }
    else if(operation=='*')
    {
        return a*b;
    }
    else if(operation=='/')
    {
        if(b==0)
        {
            printf("除数不能为0!!!\n");
        }
        else
        {
            return a/b;
        }
    }
    else
    {
        printf("输入错误!!!\n");
    }
    return 0;
}

int main()
{
    double a,b;
    char operation;
    scanf("%lf%c%lf", &a, &operation, &b);
    printf("%lf\n", calculator(a,b,operation));
    return 0;
}